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Concepts from Lecture 25

Concepts from Lecture 25 - descendents Paraphyletic(not all...

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When evaluating traits that are similar they can be similar because they are homologous or analogous. Homology is similar due to shared ancestry Analogy is convergent evolution (looks similar but arrived at from different evolutionary source). Homologous structures include bone structure forelimbs in some animals. Analagous structures are wings of birds and insects. See this website if you are confused: http://evolution.berkeley.edu/evolibrary/article/similarity_hs_01 Classification of clades – groupings of taxa. Monophyletic (all descend from a common ancestor and include ALL descendents) Paraphyletic (all descend from common ancestor but does not include ALL of the
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Unformatted text preview: descendents) Paraphyletic (not all descend from a common ancestor) See updated slides 15,16,17 for the pictures Shared ancestral characteristic – this characteristic or trait evolved before the clade evolved so it is shared with individuals who are not part a monophyletic clade. Shared derived characteristic – this characteristic or trait evolved when the clade evolved so it is shared with individuals. Dating fossils. Common strata layers. Dating methods – radioactive decay, magnetism of rocks Stromalites are oldest example of life – date back 3.5 Billion years...
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